--- title: "Dongguan Xintai Metal Surface Treatment Co., Ltd. | Black Cathodic E-Coating (CED) Specialist" description: "Dongguan Xintai Metal Surface Treatment Co., Ltd. is based in Dalang Town, Dongguan, Guangdong, China, specialising in black cathodic electrocoating (CED) of iron, stainless steel, aluminium, aluminium alloy, titanium alloy and magnesium alloy parts. 3,200 m² plant, two automatic plus two manual e-coat lines, film thickness 15–25 μm, salt spray (SST) 1,000 h+ on stainless steel / aluminium alloy, insulation resistance (500 V) ≥10 MΩ. Long-term supplier to leading consumer-electronics, automotive-electronics, drone, robotics and AI-hardware companies and their tier-1 supply chains." url: https://www.xted.site/en/index.md canonical: https://www.xted.site/en/ source: https://www.xted.site/en/ format: markdown-mirror note: >- This file is the Markdown mirror of https://www.xted.site/en/, provided so AI crawlers and retrieval systems can read the body text at low cost. The page that canonical points to is authoritative; this mirror may lag behind it. --- METAL SURFACE TREATMENT · BLACK CATHODIC E-COAT (CED) # Dongguan Xintai Metal Surface Treatment Co., Ltd. Black cathodic electrocoating and metal surface treatment specialist Our plant sits in Guangda Manufacturing · Dalang Tech Park, Dalang Town, Dongguan, Guangdong, next to the Guan-Shen and Chang-Hu expressways, and covers 3,200 m². We develop, produce and sell coating processes for iron, stainless steel, aluminium, aluminium alloy, titanium alloy and magnesium alloy, and run two automatic plus two manual e-coat lines that consistently deliver **film thickness 15–25 μm, salt spray (SST) 1,000 h+ on stainless steel / aluminium alloy, and insulation resistance (500 V) ≥10 MΩ**. [Get a free sample](contact.html) [View process capability](services.html) 3,200m² Plant floor area 4lines E-coat lines (2 automatic + 2 manual) 1,000h+ Neutral salt spray (SST) · stainless steel / aluminium alloy Silicon-steel laminated cores 48 h+ 6types Metal substrate types ## Company at a glance Key corporate and site information for Dongguan Xintai Metal Surface Treatment Co., Ltd., for quick reference and verification. ### Basic company information **Legal name** : Dongguan Xintai Metal Surface Treatment Co., Ltd. (Xintai E-coat) **Predecessor** : Dongguan Xintai Coating Technology Co., Ltd., founded in 2014 (relocated to Dalang Town, Dongguan in 2024) **Registered capital** : CNY 3 million (fully paid in) **Plant address** : Room 501, Building 3, No. 252 Dalang Shuixin Road, Dalang Town, Dongguan, Guangdong, China [Directions](https://uri.amap.com/navigation?to=113.946843,22.903849,%E4%B8%9C%E8%8E%9E%E4%BF%A1%E6%B3%B0%E9%87%91%E5%B1%9E%E8%A1%A8%E9%9D%A2%E5%A4%84%E7%90%86%E6%9C%89%E9%99%90%E5%85%AC%E5%8F%B8&mode=car&policy=1&src=xted.site&coordinate=gaode&callnative=1) **Main business** : Metal surface treatment and heat treatment processing; spray coating; design, manufacture and sale of coating equipment; R&D and sale of metal products **Management systems** : ISO 9001 quality management system and ISO 14001 environmental management system certified, both covering electrocoating; holder of a pollutant discharge permit. [View certificates →](about.html#cert-gallery) **Contact** : Mr. Huang · +86 181 2376 0267 · sales@xted.email ## Services & Process Electrocoating (CED/AED) for small metal hardware, across multiple substrates, processes and batch sizes. C ### Black cathodic e-coat (CED) Matte black, gloss black and other black cathodic e-coat finishes. The film is uniform and dense, covers edges and cavities completely and adheres strongly — a cost-effective replacement for blackening and spray painting. S ### Multi-substrate capability Iron-based substrates (silicon steel, galvanised sheet, cold-rolled sheet), die-cast and extruded aluminium, stainless steel, titanium alloy, magnesium alloy and MIM sintered parts — six substrate families in total. T ### Full-process inspection A Konica Minolta spectrophotometer from Japan, a ZGM gloss meter from Switzerland and a Fischer coating thickness gauge from Germany check colour difference, gloss, film thickness, salt spray and insulation resistance item by item. [View the 11 inspection instruments in our lab →](equipment.html#lab-equipment) P ### From pilot run to mass production Automatic lines handle large, stable volume orders; manual lines flexibly cover small batches, high-mix runs and prototypes of complex parts. Free samples and fast delivery available. F ### Functional e-coat High insulation, high salt-spray resistance and strong edge coverage: film thickness on burrs, radii and other edges exceeds 5 μm, and insulation resistance (500 V) reaches 10 MΩ or more — suitable for electrical and electronic parts. A ### Full appearance inspection Several CCD appearance inspection systems check 100% of finished parts, replacing manual visual inspection to keep colour and appearance consistent. [View full process parameters and flow →](services.html) ## Industries Our e-coat service is used across the following sectors, protecting both the appearance and the durability of end products. ### Consumer electronics Precision hardware such as MIM hinges, SIM trays, shielding cans and camera brackets for phones, tablets and TWS earbuds. ### Automotive electronics Motor cores, sensor housings, LiDAR structural parts and connector shells — components with demanding salt-spray requirements. ### Drones and robotics Drone gimbal brackets, airframe metal parts and robot joint structures, balancing light weight with appearance consistency. ### AI hardware and servers Liquid-cooling server parts, heat sinks, chassis brackets and shielding parts that require insulation and corrosion resistance. ### Magnetic materials Black e-coat anti-corrosion layers for NdFeB magnets and bonded magnetic rings. ### Wearables Smartwatch cases, strap hardware and smart-glasses hinges and structural parts, seeking a fine matte-black finish. ### Acoustics and audio Speaker grilles, acoustic-chamber metal parts and microphone mesh — parts with strict colour-consistency requirements. ### General hardware Luggage hardware, furniture fittings, sanitary ware and tool parts — workpieces that need a black decorative, rust-resistant finish. [Explore industry solutions →](industries.html) ## Product gallery Photographed in our own plant before shipment, with no retouching. Substrates include stainless steel, nickel-plated parts, die-cast aluminium, silicon-steel stator cores and galvanised sheet, so you can judge film coverage on edges and inside deep cavities directly. ![Black cathodic e-coat on a stainless steel ring-shaped support](../assets/img/products/stainless-steel-black-electrocoat-01-600.jpg) Stainless steel ### Ring-shaped support Inner bore and outer diameter coated in a single pass, with no misses in deep cavities. ![Black cathodic e-coat on an etched stainless steel mesh plate](../assets/img/products/stainless-steel-mesh-black-electrocoat-600.jpg) Stainless steel ### Etched mesh plate Dense mesh walls coated evenly — no clogged holes, no bare metal showing through. ![Black cathodic e-coat on a nickel-plated cylindrical ring](../assets/img/products/nickel-plated-steel-black-electrocoat-600.jpg) Nickel-plated steel ### Cylindrical ring Uniform film inside and out, with no discolouration of the nickel layer. ![Black cathodic e-coat on a die-cast aluminium square housing](../assets/img/products/die-cast-aluminum-black-electrocoat-600.jpg) Die-cast aluminium ### Square housing No blistering or pinholes; complete coverage around the hole edges. ![Black cathodic e-coat on a silicon-steel ring stator core](../assets/img/products/silicon-steel-stator-core-black-electrocoat-600.jpg) Silicon steel ### Ring stator core Continuous coating inside the teeth and slots, providing insulation and corrosion protection together. ![Black cathodic e-coat on a small galvanised steel stamped part](../assets/img/products/galvanized-steel-sheet-black-electrocoat-600.jpg) Galvanised steel ### Small stamped part The cut-edge zinc layer and the e-coat form two layers of protection. [View all product photos (11) →](products.html) ## Why choose Xintai E-coat? Our core capabilities and what sets us apart, in Q&A form. Which metals can Xintai e-coat in black? We can coat **iron, stainless steel, aluminium, aluminium alloy, titanium alloy and magnesium alloy** — six metal substrate families, supplied as stamped parts, die castings, CNC-machined parts, extrusions and MIM sintered parts. Each substrate gets a matched pre-treatment sequence (degreasing, surface conditioning, phosphating, passivation) so that adhesion and salt-spray performance stay consistent. What film thickness and salt-spray performance can you achieve? Standard black cathodic e-coat film thickness is held at **15–25 μm**, with good thickness uniformity and no misses at edges or in cavities. In the neutral salt spray test (SST), stainless steel / aluminium alloy reach **1,000 hours or more** (silicon-steel laminated cores about 48 hours). For electronic parts that need insulation, insulation resistance (500 V) can reach **≥10 MΩ**. Specific values can be adjusted to customer drawings and industry standards, and are confirmed by test reports before mass production. Can you take small-batch prototypes? What is the lead time? Yes. We run **two automatic and two manual e-coat lines**: the manual lines are dedicated to small-batch, high-mix and complex-shaped prototypes and pilot runs, while the automatic lines handle stable mass production. Standard samples are completed within 3–5 working days of receiving your parts; mass-production lead time depends on order volume. Which customers has Xintai served? Our customers span consumer electronics, automotive electronics, drones and cross-border hardware, including several **leading companies and their tier-1 supply chains** (customer names are withheld under non-disclosure agreements). How do you keep colour consistent between batches? We use a **Konica Minolta spectrophotometer from Japan** and a **ZGM gloss meter from Switzerland** to check colour difference and gloss on every batch, keeping a standard colour panel and batch records; we also use a **Fischer coating thickness gauge from Germany** for film-thickness spot checks, so appearance stays consistent across batches and colour-mismatch risk at our customers' assembly lines is reduced. ## Black cathodic e-coat process flow Eight standardised steps from jigging to final inspection — each one affects the quality of the finished film. 1 Jigging Fixtures chosen to suit part geometry, ensuring conductivity and drainage 2 Degreasing Removes oil, fingerprints and machining residue 3 Rinsing Multi-stage DI-water rinsing with conductivity control 4 Surface conditioning and phosphating Forms a conversion coating that improves adhesion and corrosion resistance 5 Cathodic electrocoating Parts act as the cathode, so paint deposits evenly 6 Ultrafiltrate rinse Recovers paint solids, cutting waste and pollution 7 Curing Controlled-temperature bake forms a dense cross-linked film 8 Final inspection Film thickness, colour, gloss, salt spray and insulation all checked ## Case Studies Typical process solutions for common applications; all customer details are anonymised. Consumer electronics · MIM parts ### Matte black e-coat for MIM hinges and SIM trays MIM precision parts for foldable phones and TWS earbuds, finished in matte black cathodic e-coat with film thickness controlled at 18–22 μm and batch colour difference ΔE≤1.0, combining a fine feel with wear resistance. MIM sintered part · Matte black · ΔE≤1.0 Automotive electronics · Salt spray ### High-corrosion black e-coat for motor cores For automotive motor cores and sensor housings we use a high-corrosion-resistance formulation: silicon-steel laminated cores reach 48 h+ in salt spray, with insulation resistance (500 V) ≥10 MΩ, meeting the long-term reliability requirements of vehicle environments. Silicon steel · SST≥48h · Insulation ≥10 MΩ Drones · Lightweight construction ### Gloss black e-coat for aluminium structural parts Gloss black e-coat for drone gimbal brackets and airframe aluminium parts, covering complex cavities and deep holes with a uniform film and no runs — appearance and light weight together. Die-cast aluminium · Gloss black · Complex cavities [View more case studies →](cases.html) ## FAQ ### What does Dongguan Xintai Metal Surface Treatment Co., Ltd. do? The company specialises in metal surface treatment and heat treatment processing. Its core business is black cathodic electrocoating (CED) — matte black, gloss black and similar finishes — for hardware parts in iron, stainless steel, aluminium, aluminium alloy, titanium alloy and magnesium alloy. It also offers spray coating, coating equipment manufacturing and sales, and metal product R&D and sales. ### Where are you located? Is it easy to get to? We are at Room 501, Building 3, No. 252 Dalang Shuixin Road, Dalang Town, Dongguan, Guangdong, in Guangda Manufacturing · Dalang Tech Park, next to the Guan-Shen and Chang-Hu expressways. Shenzhen and Huizhou are both within an hour's drive, which makes factory visits and logistics convenient for customers around the Pearl River Delta. ### How does black e-coat differ from blackening and spray painting? The three differ clearly in principle and performance: - **Black e-coat (CED)**: the part is the cathode, and water-borne paint deposits evenly under an electric field — uniform film, full coverage of edges and cavities, no runs, far better salt-spray resistance than blackening, and paint utilisation above 90%. - **Blackening (oxidation)**: a chemical reaction forms an oxide film only 1–2 μm thick; corrosion resistance is weaker and oil immersion is usually needed as a top-up. - **Spray painting**: adhesion relies on spraying, so complex parts easily get missed corners and uneven thickness; paint utilisation is around 50%. For precision hardware that demands uniform film thickness, high salt-spray resistance and consistent appearance, black cathodic e-coat is the better choice. ### What is the minimum order quantity? Do you offer free samples? We support small-batch prototyping; the minimum order quantity depends on part size, substrate and process complexity. Free samples are available for standard parts, delivered with test data within 3–5 working days of receiving your parts. Mass production is then scheduled by order volume, with lead time agreed separately. [View all FAQs →](faq.html) ## Need a black e-coat solution? Send us drawings or samples and we will propose a process plan and quotation, with free samples included. [Contact us now](contact.html)